JP6018395B2 - Rotary damper for vehicle seat - Google Patents

Description

  In the present invention, a rotating body having a vane is rotatably accommodated in a container for accommodating a viscous fluid, and braking is applied to the rotation of the rotating body by the viscous fluid, whereby the seat can be rotated freely. The present invention relates to a rotary damper for a vehicle seat that provides moderate rotational braking to a backrest that is connected and foldable.

  A one-way rotary damper of this type that gives a large brake to one rotation of the rotating body and a small brake to the other rotation of the rotating body by the viscous fluid passing through the gap. It is known from Patent Document 1 and the like.

JP 2005-188636 A JP-A-9-42350 JP 9-329173 A JP-A-8-109940 JP-A-8-296687

  In vehicle seats for automobiles, etc., when the backrest is manually rotated from the initial rotation position to the folding rotation position and vice versa, the rotational force (rotational moment) due to the weight of the backrest according to the rotation position of the backrest When the backrest portion is folded and rotated from the rotation position to the initial rotation position, a large manual force is required.

  A spiral spring that imparts an elastic rotational force to the backrest portion that increases as it approaches the folding rotational position from a predetermined rotational position between the initial rotational position and the folding rotational position and resists rotation in the direction toward the folding rotational position. If the rotation of the backrest is manually performed without being affected by the rotational force due to the weight of the backrest, the above functions may not be obtained unless the end of the spiral spring is firmly held. .

  The present invention has been made in view of the above-mentioned points, and the object of the present invention is to enable the manual rotation of the backrest portion without being affected by the rotational force due to the weight of the backrest portion. An object of the present invention is to provide a rotary damper for a vehicle seat that can reliably obtain the function of a spiral spring.

  A rotary damper for a vehicle seat according to the present invention is provided on one of a seat portion of a vehicle seat and a backrest portion rotatably connected to the seat portion so as to be rotatable between an initial rotation position and a folding rotation position. A space that accommodates a viscous fluid between a container body that is fixed and has a cylindrical inner peripheral surface, and a cylindrical inner peripheral surface of the container and a cylindrical outer peripheral surface that is concentric with the inner peripheral surface. And a rotation fixed to a rotating shaft fixed to the other one of the seat portion and the backrest portion of the vehicle seat, and is arranged so as to be relatively rotatable with respect to the housing body. The relative rotation in one direction of the rotating body with respect to the body and the container in the direction from the initial rotation position of the backrest portion to the folding rotation position causes a large flow resistance to the viscous fluid, and the initial rotation position from the folding rotation position of the backrest portion. Container in the direction toward In the relative rotation in the other direction, which is opposite to the relative rotation in one direction of the rotating body, the cylindrical inner peripheral surface of the container is provided so as to generate a flow resistance smaller than the flow resistance. And a vane means disposed in a space for accommodating a viscous fluid between the cylindrical outer peripheral surface of the rotating body and one end connected to one of a seat portion and a backrest portion of the vehicle seat, while the other The end is connected to the rotary shaft fixed to the other one of the seat portion and the backrest portion of the vehicle seat, and the backrest portion is changed from the predetermined rotation position between the initial rotation position and the folding rotation position to the folding rotation position. A spiral spring that increases as it approaches and imparts an elastic rotational force that resists rotation in the direction toward the folding rotational position, the spiral spring with respect to the rotating body and a seat portion of the vehicle seat; Arranged on the backrest side Rutotomoni other end is configured to be coupled to the rotary shaft by being fitted into a slit extending in the axial direction formed in the rotary shaft.

  According to the rotary damper for a vehicle seat of the present invention, the spiral spring increases from the predetermined rotation position between the initial rotation position and the folding rotation position to the folding rotation position and approaches the folding rotation position on the backrest portion. In the relative rotation of the rotating body in one direction with respect to the container in the direction from the initial rotation position of the backrest portion to the folding rotation position, the elastic rotation force that resists the rotation of the direction is applied. , A large flow resistance to the viscous fluid, relative rotation in the other direction that is opposite to the relative rotation in one direction of the rotating body relative to the container in the direction from the folding rotation position of the backrest to the initial rotation position Then, since each flow resistance smaller than the flow resistance is generated, when rotating the backrest portion from the initial rotation position to the predetermined rotation position, The vane means can give appropriate braking to the rotation of the backrest, and when the backrest is rotated from the predetermined rotation position to the folding rotation position, the weight of the backrest increases as the folding rotation position is approached. The rotational force in the direction toward the folding rotation position based on the above is canceled out by the rotational force of the spiral spring against this, and the backrest portion can be slowly rotated to the folding rotation position in the same direction, while the backrest portion is manually When rotating in the direction from the folding rotation position to the initial rotation position, a small braking force is applied to the rotation of the backrest by the vane means, and the rotational force of the spiral spring gradually decreases. Therefore, it can be easily rotated to a predetermined rotation position. On which can perform rotation of the rotary position lightly, clash of the backrest in the folded rotational position can be avoided.

  Further, according to the rotary damper for a vehicle seat of the present invention, one end portion is connected to one of the seat portion and the backrest portion of the vehicle seat, while the other end portion is the seat portion and the backrest portion of the vehicle seat. The rotary shaft is connected to the rotary shaft fixed to the other of the two, and the backrest portion increases from the predetermined rotation position between the initial rotation position and the folding rotation position toward the folding rotation position and toward the folding rotation position. A spiral spring that imparts an elastic rotational force that resists rotation in the direction, and the spiral spring is disposed on the seat and backrest side of the vehicle seat with respect to the rotating body, and the other end is the aforementioned Since it is configured to be connected to the rotating shaft by being inserted into an axially extending slit formed on the rotating shaft, the rotating shaft slit into which the other end of the spiral spring is inserted is provided. Expanded The elastic deformation in the direction can be prevented by the rotating body connected to the rotating shaft, and thus the end of the spiral spring can be firmly held, and the function of the spiral spring can be reliably obtained. .

  In a preferred example of the rotary damper for a vehicle seat according to the present invention, the spiral spring is connected to the container at one end, and is elastic in the direction toward the initial rotational position from the predetermined rotational position to the folding back rotational position. To receive a reaction force generated at one end of the spiral spring when applying a rotational force, and a folding rotation of the first reaction force receiving member fixed to the container and the backrest portion from the predetermined rotation position to the initial rotation position A second reaction force receiving member fixed to the container is provided to receive a reaction force generated at one end in applying an elastic rotational force in a direction toward the position. According to such a rotary damper of the vehicle seat, the end of the spiral spring can be firmly held, and the function of the spiral spring can be reliably obtained.

  In the rotary damper for a vehicle seat according to the present invention, the spiral spring applies an elastic rotational force in the direction from the predetermined rotational position to the initial rotational position to the backrest portion from the predetermined rotational position to the initial rotational position. Until the backrest portion is applied with an elastic rotational force in a direction toward the folding rotation position, and one end portion of the spiral spring is interposed between the first reaction force receiving member and the second reaction force receiving member. Even if it is interposed, the rotation of the backrest portion in the direction from the predetermined rotation position toward the folding rotation position gradually increases against the gradually increasing rotational force generated in the backrest portion in the direction toward the folding rotation position based on the weight of the backrest portion. An elastic rotational force may be applied to the backrest portion.

  In the vehicle seat rotary damper according to the present invention, the vane means divides a space for accommodating the viscous fluid between the cylindrical inner peripheral surface of the container and the cylindrical outer peripheral surface of the rotating body into two chambers. A pair of elastic flexible vanes integrally formed on the outer peripheral surface of the rotating body and at least one of the two chambers partitioned by the pair of elastic flexible vanes are further divided into two chambers. And another elastic flexible vane formed integrally with the inner peripheral surface of the container. In this case, the other elastic flexible vane is integrally formed with the inner peripheral surface of the container. And an elastically flexible tongue portion formed integrally with the base portion and having an arcuate surface facing the outer peripheral surface of the rotating body.

  In each of such other elastic flexible vanes, the tongue portion is a circle that forms a pair of wedge spaces facing each other in the rotational direction of the relative rotation of the rotating body with respect to the container and the outer peripheral surface of the rotating body. The arc-shaped concave surface may have an arc-shaped concave surface, and the arc-shaped concave surface communicates with one of the two chambers adjacent to each other with the arc-shaped concave surface interposed in the rotational direction of the relative rotation of the rotating body with respect to the container. The radial width of one wedge space such that the radial width of one wedge space gradually decreases toward the other wedge space communicating with the other of the two adjacent chambers. And the radial width of the other wedge space communicating with the other of the two adjacent chambers is directed toward one wedge space communicating with one of the two adjacent chambers. The width of the other wedge space in the radial direction so that it gradually becomes narrower. The viscous fluid that passes through the pair of wedge spaces elastically deflects each of the other elastic flexible vanes, and the radial width of the pair of wedge spaces is determined by the viscosity. It may be.

  Other elastic flexible vanes also act in the same manner as the elastic flexible vanes described above, and the generated braking is not dependent on temperature and can exhibit braking that does not change at high or low temperatures.

  In a preferred example of the vehicle seat rotary damper according to the present invention, each of the pair of elastic flexible vanes is connected to the outer peripheral surface of the rotating body at one end, and is relatively rotated in one direction of the rotating body with respect to the container. A curved convex surface convex in the opposite direction, and a curved concave surface connected to the outer peripheral surface of the rotating body at one end corresponding to the convex surface and extending along the convex surface. The convex surface is, on the other end side, an arc-shaped convex surface that forms a pair of wedge spaces facing each other in the rotational direction of the relative rotation of the rotating body with respect to the container, with the inner peripheral surface of the container. The arcuate convex surface is a radial width of one wedge space communicating with one of the two adjacent chambers with the arcuate convex surface in the rotation direction of the relative rotation of the rotating body with respect to the container. The relative rotation of the rotating body relative to the container The width in the radial direction of the one wedge space so as to gradually narrow toward the other wedge space communicating with the other of the two adjacent chambers with the arcuate convex surface in the rolling direction And the radial width of the other wedge space communicating with the other of the two adjacent chambers with the arcuate convex surface in the rotation direction of the relative rotation of the rotating body with respect to the container. In the rotational direction of the relative rotation of the rotating body with respect to the container, so as to gradually narrow toward one wedge space communicating with one of the two adjacent chambers with the arcuate convex surface therebetween, The radial width of the other wedge space is determined, and the viscous fluid passing through the pair of wedge spaces elastically deflects each of the pair of elastic flexible vanes, and the viscosity of the pair of wedge spaces depends on the viscosity. Is designed to determine the radial width of Each of the pair of elastic flexible vanes passes through a pair of wedge spaces narrowed from the other chamber to the one chamber in rotation with respect to the seat portion of the backrest portion from the initial rotation position to the folding rotation position via the predetermined rotation position. An initial rotational position from the folding rotational position via a predetermined rotational position while the viscous fluid is configured to generate a flow resistance that is defined by the pair of narrowed wedge spaces and resists the rotation. In the rotation of the backrest portion with respect to the seat portion, it flows through a pair of wedge spaces widened from one chamber to the other chamber and is defined by the pair of widened wedge spaces and resists the rotation. Flow resistance is generated in a viscous fluid.

  In the rotary damper for a vehicle seat according to the present invention, the backrest portion is rotated in the direction from the initial rotation position to the folding rotation position to rotate with respect to the container so as to enlarge one chamber and reduce the other chamber. When the body is rotated, the pressure of the viscous fluid is applied to the concave surface of the elastic flexible vane, so that the other end of the elastic flexible vane approaches the other of the container and the rotating body. As a result of elastic deformation of the elastic flexible vane so as to reduce the pair of wedge spaces, the viscous fluid flows from the other chamber to the one chamber through the pair of reduced wedge spaces, and the reduced pair of wedge spaces. Large braking due to the flow resistance of the viscous fluid passing through the wedge space is given to the rotation of the rotating body with respect to the container, and the rotation in the direction toward the folding rotation position based on the weight of the backrest that increases as the folding rotation position is approached. The force is canceled by the rotational force of the spiral spring in the direction from the predetermined rotational position between the initial rotational position and the folding rotational position to the initial rotational position that increases as the folding rotational position is approached, and the backrest portion is in the same direction. While slowly rotating to the folding rotation position, the backrest is manually rotated in the direction from the folding rotation position to the initial rotation position to reduce one chamber and expand the other chamber. When the rotating body is rotated, the pressure of the viscous fluid is applied to the curved convex surface of the elastic flexible vane. Therefore, the other end of the elastic flexible vane is placed between the container and the rotating body. As a result of elastic deformation of the elastic flexible vane so as to widen the pair of wedge spaces away from the other, the viscous fluid flows from one chamber to the other through the pair of widened wedge spaces. Unfolded Based on the weight of the backrest that decreases as the rotating body is rotated relative to the container and decreases from the folding rotational position toward the predetermined rotational position, with a small braking force due to the relatively small flow resistance of the viscous fluid passing through the pair of wedge spaces. Since the rotational force of the spiral spring against the rotational force in the direction toward the folding rotational position also gradually decreases, the backrest is easily rotated from the predetermined rotational position to the initial rotational position while being easily rotated to the predetermined rotational position by a small manual force. Is rotated with a gradually increasing elastic braking by a spiral spring, and thus the manual rotation of the backrest portion to the folding rotation position and the initial rotation position can be easily performed. The collision of the backrest at the folding rotation position and the initial rotation position can be avoided, and the initial rotational force of the backrest is stored in advance in the spiral spring. be able to.

  Further, in the rotary damper for a vehicle seat according to the present invention, in the two chambers divided by the pair of elastic flexible vanes and adjacent in the rotational direction of the relative rotation of the rotating body with respect to the containing body, Enlarge one chamber located on the relative rotation side in the other direction opposite to the relative rotation in one direction of the rotating body and reduce the other chamber on the relative rotation side in one direction of the rotating body relative to the container When the rotating body is rotated with respect to the container, the pressure of the viscous fluid is applied to the respective concave surfaces of the pair of elastic flexible vanes, and thus each of the pair of elastic flexible vanes. As a result of each of the pair of elastic flexible vanes being elastically deformed so that the other end side of the pair approaches the inner peripheral surface of the container and the pair of wedge spaces are contracted, the viscous fluid flows into the pair of contracted wedge spaces. Through one chamber from the other A large amount of braking by the viscous fluid passing through the reduced pair of wedge spaces is applied to the rotation of the rotating body, while rotating with respect to the container so as to reduce one chamber and expand the other chamber. When the body is rotated, since the pressure of the viscous fluid is applied to the curved convex surfaces of the pair of elastic flexible vanes, the other end portions of the pair of elastic flexible vanes are accommodated. As a result of the elastic deformation of each of the pair of elastic flexible vanes so as to widen the pair of wedge spaces away from the inner peripheral surface of the body, the viscous fluid passes from the other chamber through the pair of widened wedge spaces. A small brake is applied to the rotation of the rotating body by the viscous fluid passing through the pair of expanded wedge spaces and passing through the pair of expanded wedge spaces, and operates as a one-way damper.

  And according to the rotary damper of the vehicle seat of the present invention that functions as a one-way damper, when the viscous fluid whose viscosity decreases as the temperature rises passes through a pair of wedge spaces in the rotation of the rotating body relative to the container For example, when a viscous fluid having a viscosity increased at a low temperature compared with that at normal temperature (20 ° C.) passes through a pair of wedge spaces, the pressure of the viscous fluid in the pair of wedge spaces increases due to an increase in the pressure of the viscous fluid. As a result of the elastic flexible vane being elastically deformed so that the other end side is separated from the other of the housing body and the rotating body, the pair of wedge spaces are widened. As a result, the viscosity of the viscous fluid itself increases and the pair of wedge spaces expands. Due to the decrease in flow resistance, braking at normal temperature can be maintained despite the low temperature, while when a viscous fluid having a lower viscosity than normal temperature at high temperature passes through a pair of wedge spaces, In As a result of the pressure reduction of the elastic fluid, the elastic flexible vane is elastically deformed so that the other end side of the elastic flexible vane approaches the other of the housing body and the rotating body, thereby narrowing the pair of wedge spaces. Braking at normal temperature can be maintained regardless of the high temperature by reducing the viscosity of itself and increasing the flow resistance due to the reduction of the pair of wedge spaces. However, it is possible to obtain braking that does not change even at low temperatures.

  In a preferred example of the rotary damper for a vehicle seat according to the present invention, the concave surface extends along the convex surface so as to gradually approach the convex surface from one end portion to the other end portion of the convex surface, and the arc-shaped convex surface has a cylindrical inner surface. The curvature radius is smaller than the curvature radius of the peripheral surface.

  In the vehicle seat rotary damper of the present invention, the predetermined rotational position between the initial rotational position and the folding rotational position is such that the rotational force in the direction toward the folding rotational position based on the weight of the backrest portion in the rotatable range of the backrest portion. The spiral spring may be a position that starts to occur in the backrest part, and the spiral spring applies an elastic rotational force that gradually increases in the direction toward the initial rotation position to the backrest part from the predetermined rotation position to the folding rotation position. Good.

  As the viscous fluid according to the present invention, silicone oil can be cited as a preferred example, but other viscous fluids may be used, and the container may be made of metal, but it is light in weight and cost. It may be made of a hard synthetic resin for reasons such as reduction of the rotation, and the rotating body may also be made of metal, but may be made of a hard synthetic resin for reasons such as weight reduction and cost reduction. Well, each elastic flexible vane may be separated from the rotating body and fixed to the rotating body by welding, fitting, adhesion, etc., but preferably it is integrally formed with the rotating body or the container body. When the rotating body or the container body and the elastic flexible vane are integrally formed, the rotating body or the container is made of a synthetic resin material that imparts appropriate elasticity to the elastic flexible vane. Is preferred.

  In the vehicle seat rotary damper according to the present invention, the housing body is connected to the backrest portion, while the rotating body is connected to the seat portion, and the housing body is rotated relative to the rotating body according to the rotation of the backrest portion. Well, conversely, the container may be connected to the seat, while the rotating body may be connected to the backrest, and the rotating body may be rotated relative to the container in accordance with the rotation of the backrest. The housing body or the rotating body may be connected directly or indirectly via a rotating shaft, a gear, or the like.

  According to the present invention, it is possible to comfortably perform manual rotation of the backrest portion without being influenced by the rotational force due to the weight of the backrest portion, and it is possible to reliably obtain the function of the spiral spring. A rotary damper may be provided.

FIG. 1 is an attachment explanatory diagram of an example of an embodiment of the present invention. 2 is a cross-sectional explanatory view taken along the line II-II in FIG. 3 of the example shown in FIG. 3 is a cross-sectional explanatory view taken along the line III-III in FIG. 6 of the example shown in FIG. 4 is a cross-sectional explanatory view taken along the line IV-IV in FIG. 6 of the example shown in FIG. FIG. 5 is a front view of the example shown in FIG. 6 is a rear view of the example shown in FIG. FIG. 7 is a perspective view of the example shown in FIG. FIG. 8 is a partially enlarged explanatory view of the example shown in FIG. FIG. 9 is a cross-sectional explanatory view in which a rotating shaft is attached to the example shown in FIG. 10 is a perspective view of the rotating shaft shown in FIG. FIG. 11 is an explanatory diagram of an example in which the example shown in FIG. 1 is mounted on a vehicle seat. FIG. 12 is a diagram for explaining the operation of the example shown in FIG. FIG. 13 is an operation explanatory diagram of the example shown in FIG.

  Next, embodiments of the present invention will be described in more detail based on preferred examples shown in the drawings. The present invention is not limited to these examples.

  1 to 8, a rotary damper 1 for a vehicle seat according to the present embodiment rotates on a synthetic resin container 3 having a cylindrical inner peripheral surface 2, an inner peripheral surface 2, and the inner peripheral surface 2. A space 6 is formed in the housing 3 so as to form a space 6 for housing a viscous fluid 5 made of silicone oil or the like, the viscosity of which decreases with an increase in temperature, with the cylindrical outer peripheral surface 4 concentric with respect to the axis O. A synthetic resin-made rotating body 7 that is arranged to be rotatable in the R1 and R2 directions relative to the container 3 about the rotation axis O, and a relative relationship in one direction of the rotating body 7 with respect to the container 3 Rotation in the R1 direction of the rotating body 7 with respect to the container 3 in this example, a large flow resistance is exerted on the viscous fluid 5 in a direction opposite to the relative rotation of the rotating body 7 with respect to the container 3 in one direction. In the relative rotation in the other direction, in this example, the rotating body with respect to the container 3 In the rotation in the R2 direction, the vane means 8 disposed in the space 6 is connected to the seat portion 11 of the vehicle seat 10 at one end 9 in order to generate a flow resistance smaller than the flow resistance. The other end portion 12 is connected to a rotation shaft 51 fixed to the backrest portion 13 of the vehicle seat, and the backrest portion 13 is folded from a predetermined rotation position P1 between the initial rotation position P0 and the folding rotation position P2 to the folding rotation position P2. And a spiral spring 14 that imparts an elastic rotational force against the rotation in the direction R1, which is a direction toward the folding rotation position P2.

  In the vehicle seat rotary damper 1, in addition to the above-described configuration, the spiral spring 14 is connected to the housing 3 at one end portion 9, and to the backrest portion 13 from the predetermined rotational position P1 to the folding rotational position P2. A screw as a first reaction force receiving member fixed to the container 3 so as to receive a reaction force generated at one end 9 of the spiral spring 14 in the application of the elastic rotation force in the R2 direction toward the initial rotation position P0. 37 and the container 3 in order to receive the reaction force generated at the one end 9 in the application of the elastic rotational force in the R1 direction toward the folding rotational position P2 to the backrest 13 from the predetermined rotational position P1 to the initial rotational position P0. And a square-shaped member 90 as a second reaction force receiving member fixed thereto. The screw 37 is wound around the one end 9 and passes through the through hole 36. The member 90 may be integrally formed with the lid body 33 of the container 3 or may be screwed.

  One of the seat portion 11 and the back portion 13 that is rotatably connected to and supported in the R1 and R2 directions so that the seat portion 11 and the seat portion 11 can rotate between the initial rotation position P0 and the folding rotation position P2, in this example. The container 3 fixed to the seat portion 11 has a diameter at a cylindrical portion 15 having a cylindrical inner peripheral surface 2 and one annular end portion 16 in the A direction that is the axial direction of the cylindrical portion 15. A plurality of screws at the flange portion 19 having an inner peripheral surface 18 that is integrally formed toward the inside in the direction and that defines the through-hole 17, and the other annular end portion 20 in the A direction of the tube portion 15. 21 and a lid 22 fixed by 21.

  The flange portion 19 defines one side in the A direction of the space 6 with one side surface 25 in the A direction, and the lid body 22 has an inner peripheral surface 34 that defines a central through hole 31 and A A lid body 33 composed of an elliptical plate body defining the other side of the space 6 in the A direction with one side surface 32 in the direction, and an annular projection 35 formed integrally with the side surface 32 and projecting in the A direction. The lid body 33 fixed to the other annular end 20 in the A direction of the cylindrical portion 15 with a plurality of screws 21 has through holes 36 at both ends. The container 3 is fixed to the seat 11 via the lid body 33 through the lid body 33.

  The outer peripheral surface 4 that forms the space 6 with the inner peripheral surface 2 and the inner peripheral surface 42 that defines the hollow portion 41 and the other of the seat portion 11 and the backrest portion 13 in the present embodiment, the backrest portion 13. The hollow rotating body 7 fixed via the rotating shaft 51 has an annular end portion 43 and 44 in the axial direction A at the inner peripheral surface 18 of the flange portion 19 of the container 3 and the inner periphery of the lid body 33. The inner peripheral surface 42 that is supported by the surface 34 so as to be rotatable in the directions R1 and R2 is hexagonal, and the hexagonal inner periphery of the rotating body 7 is formed. For example, as shown in FIG. 9, one end 52 side of the hexagonal cross section of the rotating shaft 51 is fitted to the surface 42, and the rotating shaft 51 is connected to the seat portion 11 and the seat portion 11 on the other end side. And the other of the backrest portions 13 that are rotatably connected in the R2 direction, in this example, the backrest portion 13 is fixed. More specifically, the rotating body 7 connected to the backrest portion 13 through the rotating shaft 51 and more specifically through the one end 52 side of the rotating shaft 51 fitted to the hexagonal inner peripheral surface 42 is: The rotating shaft 51 is rotated in the same direction by the rotation of the rotating shaft 51 in the R1 and R2 directions, and further by the rotation of the backrest portion 13 in the R1 and R2 directions. Thus, the rotating body 7 is fixed to the backrest portion 13. Yes.

For example, as shown in FIG. 10, the rotating shaft 51 includes a hexagonal outer peripheral surface 55 from one end 52 (tip portion 59) to the other end of the rotating shaft 51 and a slit 58 extending in the axial direction from the one end 52. have. Tip 59 of the end portion 52 is adapted to bifurcated by slits 58.

  Between the inner peripheral surface 18 of the flange portion 19 and the end portion 43 of the rotating body 7 in the axial direction A, between the end portion 20 of the cylindrical portion 15 and the protrusion 35 fitted to the end portion 20, and of the rotating body 7. A seal ring 60 for preventing leakage of the viscous fluid 5 from the space 6 to the outside of the container 3 and the rotating body 7 is disposed between the end 44 in the axial direction A and the inner peripheral surface 34. .

  In the rotation in the R1 direction, which is the direction from the initial rotation position P0 of the backrest 13 to the folding rotation position P2, a large flow resistance is exerted on the viscous fluid 5, and in the direction from the folding rotation position P2 of the backrest 13 to the initial rotation position P0. In the rotation in a certain R2 direction, the vane means 8 for generating a flow resistance smaller than the flow resistance is the cylindrical inner peripheral surface 2 of the container 3 and the cylindrical shape of the rotary body 7 concentric with the inner peripheral surface 2. A pair of annular spaces 6 inside the housing 3 for housing the viscous fluid 5 between the outer circumferential surface 4 and the two outer chambers 61 and 62 and integrally formed on the outer circumferential surface 4 of the rotating body 7. The elastic flexible vanes 63 and 64 and at least one of the two chambers 61 and 62 defined by the pair of elastic flexible vanes 63 and 64, each of the two chambers 61 and 62 in this example, are further divided into two. Chamber 65 and 66 lined up And a pair of resiliently flexible vanes 69 and 70 as another elastic flexible vanes formed integrally with the inner peripheral surface 2 of the housing body 3 as well as sections 67 and 68.

  In the elastic flexible vanes 63 and 64 and 69 and 70, the elastic flexible vane 63 and the elastic flexible vane 64, and the elastic flexible vane 69 and the elastic flexible vane 70 are rotational axes. Since the elastic flexible vane 63 and the elastic flexible vane 69 will be described in detail below, the elastic flexible vane 64 and the elastic flexible vane 70 will be described in detail. Is described and illustrated with the same reference numerals as the elastic flexible vane 63 and the elastic flexible vane 69.

  The elastic flexible vane 63 that divides the chamber 66 and the chamber 67 is connected to the outer peripheral surface 4 of the rotating body 7 at one end portion, and has a curved convex surface 71 that is convex in the R2 direction, and a convex surface 71 Correspondingly, one end portion is connected to the outer peripheral surface 4 of the rotating body 7 and extends along the convex surface 71 so as to gradually approach the convex surface 71 from one end portion to the other end portion of the convex surface 71 and terminates with the end of the convex surface 71. And a curved concave surface 72.

  The convex surface 71 has a pair of wedge spaces 73 and 74 facing each other in the R1 and R2 directions which are also the rotation direction R of the relative rotation of the rotating body 7 with respect to the container 3 on the other end side. And an arcuate convex surface 75 having a radius of curvature smaller than the radius of curvature of the inner peripheral surface 2, and the arcuate convex surface 75 of the one wedge space 73 communicating with the chamber 66. The width in the B direction, which is the radial direction, gradually increases in the rotational direction R toward the other wedge space 74 communicating with the other chamber 67 of the two adjacent chambers 66 and 67 with the arcuate convex surface 75 therebetween. The width in the radial direction of the one wedge space 73 is determined such that the width of the other wedge space 74 communicating with the chamber 67 is in the direction of the B in the rotation direction R. Of adjacent two chambers 66 and 67 The width of the other wedge space 74 in the B direction is determined so as to gradually become narrower toward the wedge space 73 communicating with the other chamber 66, and the viscosity passing through the pair of wedge spaces 73 and 74 is determined. The fluid 5 elastically deflects the elastic flexible vane 63 and determines the width of the pair of wedge spaces 73 and 74 in the B direction based on the viscosity thereof.

  An elastic flexible vane 63 having a convex surface 71 and a concave surface 72 and having a thickness that gradually decreases from the outer peripheral surface 4 toward the inner peripheral surface 2 includes a base 76 connected to the rotating body 7 and an arc-shaped convex surface 75. It has the free end part 77 which has, and is integrally formed in circular arc shape.

  The viscous fluid 5 passing through the pair of wedge spaces 73 and 74 passes through the pair of wedge spaces 73 and 74 narrowed from the other chamber 67 to the one chamber 66 in the rotation of the rotating body 7 in the R1 direction with respect to the container 3. The rotating body 7 is defined by the pair of narrowed wedge spaces 73 and 74 and generates a large flow resistance against the rotation in the R1 direction. In the rotation in the R2 direction, it flows through the pair of wedge spaces 73 and 74 expanded from one chamber 66 to the other chamber 67 and is defined by the expanded pair of wedge spaces 73 and 74, and in the R2 direction. A small flow resistance that resists rotation is generated.

  The elastic flexible vane 64 that divides the chamber 65 and the chamber 68 is formed in the same manner as the elastic flexible vane 63, and the viscous fluid 5 that passes through the pair of wedge spaces 73 and 74 in the elastic flexible vane 64. In addition, the elastic flexible vane 64 is elastically bent and the width of the pair of wedge spaces 73 and 74 in the B direction is determined by the viscosity thereof. The viscous fluid 5 passing through the pair of wedge spaces 73 and 74 passes through the pair of wedge spaces 73 and 74 narrowed from the other chamber 65 to the one chamber 68 in the rotation of the rotating body 7 in the R1 direction with respect to the container 3. The rotating body 7 is defined by the pair of narrowed wedge spaces 73 and 74 and generates a large flow resistance against the rotation in the R1 direction. R2 In the direction of rotation, it flows through the pair of wedge spaces 73 and 74 expanded from one chamber 68 to the other chamber 65 and is defined by the expanded pair of wedge spaces 73 and 74 and rotates in the R2 direction. It is designed to generate a small resistance against flow.

  Thus, each of the pair of elastic flexible vanes 63 and 64 has the other in rotation in the R1 direction with respect to the seat portion 11 of the backrest portion 13 from the initial rotation position P0 to the folding rotation position P2 via the predetermined rotation position P1. R1 direction is defined by the narrowed pair of wedge spaces 73 and 74 flowing from the respective chambers 67 and 65 through the narrowed pair of wedge spaces 73 and 74 to the respective one of the chambers 66 and 68. In the R2 direction with respect to the seat portion 11 of the backrest portion 13 from the folding rotation position P2 to the initial rotation position P0 via the predetermined rotation position P1, while generating a flow resistance against the rotation of the viscous fluid 5 In the rotation of the two chambers 67 and 65, respectively, through a pair of wedge spaces 73 and 74 which are expanded to each other. It has a flow resistance against relative rotation of the R2 direction while being defined by the wedge spaces 73 and 74 of the pair so as to generate a viscous fluid 5.

  An elastic flexible vane 69 that divides the chamber 61 into two chambers 65 and 66 adjacent to each other in the rotational direction R in cooperation with the elastic flexible vanes 63 and 64 is complementary to the convex surface 71 of the elastic flexible vane 63. A circular arc-shaped concave surface 81 faces the convex surface 71 of the elastic flexible vane 63 in the rotational direction R, while a cross-sectional V or U-shaped concave surface 82 is formed on the concave surface 72 of the elastic flexible vane 64. A base 83 facing in the rotation direction R, and extending in the R2 direction from the tip of the base 83 and integrally formed with the base 83, and facing the outer peripheral surface 4 of the rotating body 7 with an arcuate surface 84 An elastically flexible tongue 85, and the outer peripheral surface 4 of the rotating body 7 and the arcuate surface 84 of the tongue 85 having a radius of curvature larger than the radius of curvature of the outer peripheral surface 4. A wedge space similar to the pair of wedge spaces 73 and 74 is formed between them. An elastic flexible vane 69 that forms a wedge space similar to the pair of wedge spaces 73 and 74 on the arcuate surface 84 of the tongue 85 integrally extending in the R2 direction from the base 83, Similar to the elastic flexible vane 63, the relative rotation in the R1 direction of the rotating body 7 with respect to the container 3 allows a large resistance to the flow of the viscous fluid 5 from the chamber 65 to the chamber 66 through the pair of wedge spaces. On the other hand, the relative rotation in the R2 direction of the rotating body 7 with respect to the container 3 allows the viscous fluid 5 to flow from the chamber 66 to the chamber 65 with a small resistance.

  An elastic flexible vane 70 that divides the chamber 62 into two chambers 67 and 68 adjacent to each other in the rotation direction R in cooperation with the elastic flexible vanes 63 and 64 is formed in the same manner as the elastic flexible vane 69. The elastic flexible vane 70 that forms a pair of wedge spaces between the outer peripheral surface 4 of the rotating body 7 and the arcuate surface 84 of the tongue 85 is similar to the elastic flexible vane 69 in the R1 direction. In the relative rotation of the rotating body 7 with respect to the container 3, the flow of the viscous fluid 5 from the chamber 67 to the chamber 68 through the pair of wedge spaces is allowed with a large resistance, while the rotating body 7 with respect to the container 3 in the R2 direction. In the relative rotation, the flow of the viscous fluid 5 from the chamber 68 to the chamber 67 is allowed with a small resistance.

  One end face in the A direction of the elastic flexible vanes 63 and 64 is in close contact with the side surface 25 of the flange portion 19 so as to be slidable in the R1 and R2 directions. The other end surface in the direction is also in close contact with the side surface 32 of the lid body 33 so as to be slidable in the R1 and R2 directions, and the base 83 is integrally formed with the inner peripheral surface 2 of the cylindrical portion 15. The elastic flexible vanes 69 and 70 are formed integrally with the side surface 25 of the flange portion 19 at one end surface in the A direction, and the base 83 is integrally formed with the inner peripheral surface of the protrusion 35. The portions of the elastic flexible vanes 69 and 70 are one end face 88 in the A direction, and the portion A of the elastic flexible vanes 69 and 70 in which the base 83 is integrally formed on the inner peripheral surface 2 of the cylindrical portion 15. The other end face 89 in the direction is in close fluid contact with the other end face 89 in the direction A. It is integrally formed on the side surface 32 of the body main body 33.

  One end 9 of the spiral spring 14 as elastic means is locked to the lid body 33 of the container 3 via the screw 37 and the member 90, and the other end 12 is fitted into the slit 58, The lid body 33 is wound along the other side surface 56 in the A direction. The spiral spring 14 is disposed on the seat 11 and backrest 13 side of the vehicle seat 10 with respect to the rotating body 7 and the other end 12 is fitted in a slit 58 formed in the rotating shaft 51 and extending in the axial direction. It is configured to be connected to the rotating shaft 51 by being inserted.

  The spiral spring 14 is connected to the lid body 33 of the container 3 that is one of the container 3 and the rotating body 7 at one end 9 via a screw 37 and a member 90 that sandwich the one end 9. In addition, the other end portion 12 is connected to the rotating body 7 which is the other of the container 3 and the rotating body 7 via the rotating shaft 51, and the backrest portion 13 is folded from the predetermined rotating position P1 to the folding rotating position P2 in the R1 direction. When the rotary shaft 51 is also rotated in the same direction, it is wound in the reduced diameter direction to generate a gradually increasing elastic force against the rotation in the R1 direction, while the backrest portion 13 is folded to the folding rotation position P2. When the rotation shaft 51 is also rotated in the same direction from the rotation position P1 to the rotation direction, the elastic force that is rewound in the diameter expansion direction and resists rotation in the R1 direction is gradually reduced. Furthermore, the backrest 13 is at a predetermined rotational position. When the rotation shaft 51 is rotated in the R2 direction from 1 to the initial rotation position P0 and the rotation shaft 51 is also rotated in the same direction, the diameter of the rotation shaft is further expanded to generate a gradually increasing elastic force against the rotation in the R2 direction. When the portion 13 is rotated from the initial rotation position P0 to the predetermined rotation position P1 in the R1 direction and the rotation shaft 51 is also rotated in the same direction, an elastic force that is wound in the reduced diameter direction and resists rotation in the R2 direction is provided. Accordingly, the spiral spring 14 that does not generate an elastic force at the predetermined rotational position P1 has a backrest portion in the backrest portion 13 from the predetermined rotational position P1 to the folding rotational position P2 with respect to the seat portion 11. It resists the rotational force in the R1 direction, which is the direction toward the folding rotation position P2 that gradually increases from the predetermined rotation position P1 due to the weight of 13 to the folding rotation position P2. It adapted to impart rotation relative seat 11 of the backrest 13 the elastic rotation force in two directions.

  Thus, the spiral spring 14 applies a gradually increasing elastic rotational force in the R2 direction, which is the direction toward the initial rotational position P0, to the backrest portion 13 from the predetermined rotational position P1 to the folding rotational position P2, while the predetermined rotational position. An elastic rotational force in the R1 direction, which is a direction toward the folding rotational position P2, is applied to the backrest 13 from P1 to the initial rotational position P0.

  The one end 9 of the spiral spring 14 interposed between the member 90 and the cylindrical screw 37 is wound around the screw 37 in this example, but the one end 9 is sandwiched between the member 90 and the screw 37. When doing so, it is not particularly necessary to wind the one end 9 around the screw 37.

  In the vehicle seat 10 shown in FIG. 11, which includes a seat portion 11 attached to a vehicle body 91 of the automobile and a backrest portion 13 rotatably connected to the seat portion 11 in the R1 and R2 directions, the backrest portion 13 is provided. Is the same as the longitudinal direction of the vehicle from the initial rotational position P0 that is orthogonal to the longitudinal direction of the vehicle and tilts backward by a predetermined angle α, for example, α = 25 ° with respect to the vertical plane passing through the rotation axis O. The seat is rotatable in the R1 and R2 directions about the rotation axis O up to a folding rotation position P2 which is orthogonal to the vertical plane passing through the rotation axis O and tilted forward by a predetermined angle β, for example, β = 90 °. 11, and at the initial rotation position P0, rotation in the R1 direction and R2 direction is prohibited by a lock mechanism that can be unlocked (not shown), and at the folding rotation position P2, Rotation in the R1 direction beyond the folding rotation position P2 is prohibited by a stop member not shown, and a predetermined rotation located on a vertical plane passing through the rotation axis O from the initial rotation position P0 when the lock mechanism is unlocked. Up to the position P1, the spiral spring 14 is rotated in the R1 direction by the reduced diameter elastic rotational force against the flow resistance of the relatively large viscous fluid 5 passing through each pair of wedge spaces including the pair of wedge spaces 73 and 74. From the predetermined rotational position P1 to the folding rotational position P2, the flow resistance of the relatively large viscous fluid 5 passing through each pair of wedge spaces including the pair of wedge spaces 73 and 74 and the weight of the backrest portion 13 are On the other hand, the spiral spring 14 is rotated in the R1 direction by its own weight against the diameter-enlarged elastic rotational force in the R2 direction against the gradually increasing rotational force in the R1 direction. From the position P2 to the predetermined rotational position P1, a pair of spiral springs 14 resists a gradually decreasing rotational force in the R1 direction based on the weight of the backrest 13 under the assistance of a gradually decreasing diameter-expanding elastic rotational force in the R2 direction. Are rotated in the R2 direction manually against the flow resistance of the relatively small viscous fluid 5 passing through each pair of wedge spaces 73 and 74, and initially rotated from a predetermined rotational position P1. Up to the position P0, the flow resistance of the relatively small viscous fluid 5 passing through each pair of wedge spaces 73 and 74 and the gradually decreasing elastic rotational force in the R1 direction of the spiral spring 14 are resisted. Then, it is manually rotated in the R2 direction and the spiral spring 14 is made to store a reduced-diameter elastic rotational force.

  In the above-described vehicle seat rotary damper 1 functioning as a one-way rotary damper, the backrest 13 is a spiral spring at the rotational position (corresponding to the initial rotational position P0) of the rotating body 7 shown in FIG. Rotating body 7 is rotated in the R1 direction with respect to the container 3 so as to expand the chambers 66 and 68 while rotating in the R1 direction with the assistance of the 14-diameter elastic force. In doing so, the pressure of the viscous fluid 5 is applied to the concave surface 72 of the elastic flexible vanes 63 and 64 and the concave surface 82 of the elastic flexible vanes 69 and 70, so that the elastic flexible vanes 63 and 64 are applied. The other end side of the free end portion 77 side approaches the inner peripheral surface 2 of the container 3, and the tongue portion 85 side of the elastic flexible vanes 69 and 70 approaches the outer peripheral surface 4 of the rotating body 7. Each pair of wedges including 73 and 74 As a result of elastic deformation of the elastic flexible vanes 63 and 64 and the elastic flexible vanes 69 and 70 so as to reduce the gap therebetween, the viscous fluid 5 includes a pair of wedge spaces 73 and 74 which are reduced. The viscous fluid 5 flows through each pair of wedge spaces, including the reduced wedge spaces 73 and 74, flowing through the spaces from chambers 65 and 67, respectively, to chambers 68 and 66, respectively, and chambers 66 and 68, respectively. Is applied to the rotation of the rotating body 7 in the R1 direction to slowly rotate the backrest portion 13 in the same direction to the predetermined rotation position P1, and the backrest portion from the predetermined rotation position P1 to the folding rotation position P2. When 13 is rotated in the R1 direction, the spiral spring 14 is gradually reduced in diameter, and the rotational force in the R1 direction gradually increases toward the folding rotation position P2 based on the weight of the backrest 13. Viscous fluid that passes through each pair of wedge spaces including a pair of wedge spaces 73 and 74 that are counteracted by the radially expanding elastic rotational force in the R2 direction of the spiral spring 14 and reduced in the R1 direction of the backrest 13. On the other hand, the backrest 13 is rotated from the folding rotational position P2 to the predetermined rotational position P1 at the rotational position (corresponding to the folding rotational position P2) of the rotating body 7 shown in FIG. When the rotating body 7 is rotated in the R2 direction with respect to the container 3 so as to expand the chambers 65 and 67 while being manually rotated in the R2 direction while reducing the chambers 66 and 68, the elastic force is allowed. Since the pressure of the viscous fluid 5 is applied to the curved convex surfaces 71 of the flexible vanes 63 and 64 and the concave surfaces 81 of the elastic flexible vanes 69 and 70, the free ends of the elastic flexible vanes 63 and 64 are provided. Each pair 77 includes a pair of wedge spaces 73 and 74, with the side 77 of the container 3 away from the inner peripheral surface 2 and the tongue 85 of the elastic flexible vanes 69 and 70 away from the outer peripheral surface 4 of the rotating body 7. As a result of the elastic flexible vanes 63 and 64 and the elastic flexible vanes 69 and 70 being elastically deformed so as to widen the wedge space, the viscous fluid 5 has a pair of wedge spaces 73 and 74 each including a widened wedge space 73 and 74. Viscosity flowing through the space from each of the chambers 66 and 68 to each of the chambers 67 and 65 and each of the chambers 65 and 67 and passing through each pair of wedge spaces, including this pair of expanded wedge spaces 73 and 74. A small braking due to a relatively small flow resistance of the fluid 5 and a radially expanding elastic rotational force in the R2 direction that the gradual decrease of the spiral spring 14 is given to the rotation of the rotating body 7 in the R2 direction, and from the folding rotational position P2 to a predetermined rotational position P1. Backrest 13 As a result of being manually rotated in the R2 direction, the backrest portion 13 can be rotated to a predetermined rotation position P1 with a small manual force, and the backrest portion 13 is further manually moved in the R2 direction from the predetermined rotation position P1 to the initial rotation position P0. When the rotating body 7 is rotated in the R2 direction with respect to the container 3 so as to further expand the chambers 65 and 67 while rotating, the chambers 66 and 68 are further contracted, a pair of widened wedges. Small damping by the relatively small flow resistance of the viscous fluid 5 passing through each pair of wedge spaces including the spaces 73 and 74 and the gradually increasing elastic force by the spiral spring 14 for storing the reduced diameter elastic rotational force in the spiral spring 14. Braking is received in rotation in the R2 direction by manual force.

  According to the rotary damper 1 of the present example, when the backrest portion 13 is rotated from the predetermined rotation position P1 to the folding rotation position P2, the rotation gradually increases toward the folding rotation position P2 based on the weight of the backrest portion 13. Abrupt rotation of the backrest 13 due to force can be prevented by the spiral spring 14, and when the backrest 13 is rotated from the initial rotation position P0 to the folding rotation position P2, the vane means 8 gives a large flow resistance to the viscous fluid 5. As a result, it is possible to give an appropriate resistance to the rotation of the backrest 13 in the direction toward the folding rotation position P2, and to avoid the collision of the backrest 13 with the stop member at the folding rotation position P2. On the other hand, when the backrest 13 is manually folded and rotated from the rotational position P2 to the predetermined rotational position P1, a spiral is used. In addition to the assistance by the screw 14, the flow resistance of the viscous fluid 5 generated by the vane means 8 can be reduced. As a result, the backrest 13 can be easily rotated manually from the folding rotation position P2 to the initial rotation position P1. .

  According to the rotary damper 1, one end portion 9 is connected to the seat portion 11 of the vehicle seat 10, while the other end portion 12 is connected to the rotating shaft 51 fixed to the backrest portion 13 of the vehicle seat and the backrest. Elasticity against the rotation in the direction R1, which is a direction that increases toward the folding rotation position P2 from the predetermined rotation position P1 between the initial rotation position P0 and the folding rotation position P2 and approaches the folding rotation position P2. A spiral spring 14 that imparts a rotational force is provided, and this spiral spring 14 is arranged on the seat 11 and backrest 13 side of the vehicle seat 10 with respect to the rotating body 7 and the other end 12 is provided. Since it is configured to be connected to the rotary shaft 51 by being inserted into an axially extending slit 58 formed in the rotary shaft 51, the other end portion 12 of the spiral spring 14 is inserted and inserted. The elastic deformation in the direction in which the slit 58 of the rotating shaft 51 is expanded can be prevented by the rotating body 7 connected to the rotating shaft 51, and thus the end of the spiral spring 14 can be firmly held. Thus, the function of the spiral spring 14 can be obtained with certainty.

  According to the rotary damper 1 for a vehicle seat, the spiral spring 14 is connected to the housing 3 at one end 9 and an initial rotational position P0 to the backrest 13 from the predetermined rotational position P1 to the folding rotational position P2. A screw 37 as a first reaction force receiving member fixed to the housing 3 and a predetermined rotation so as to receive a reaction force generated at one end 9 of the spiral spring 14 in applying an elastic rotational force in the R2 direction toward In order to receive the reaction force generated at the one end portion 9 in the application of the elastic rotational force in the R1 direction toward the folding rotational position P2 to the backrest portion 13 from the position P1 to the initial rotational position P0, the first fixed to the container 3 is received. Since the square-shaped member 90 as the second reaction force receiving member is provided, the reaction force in the opposite direction generated at the one end portion 9 of the spiral spring 14 is individually generated by the screw 37 and the member 90. Can volume, and Thus, it is possible to obtain to be able to firmly hold the end portion 9 in addition to the other end 12 of the spiral spring 14 to ensure the function of the spiral spring 14.

  Further, in the rotary damper 1 functioning as a one-way damper, the viscous fluid 5 whose viscosity decreases as the temperature rises is a pair of wedges including a pair of wedge spaces 73 and 74 when the rotating body 7 rotates in the R1 and R2 directions. For example, when the viscous fluid 5 whose viscosity has increased from the normal temperature at low temperatures passes through the wedge spaces 73 and 74 at low temperatures, the viscous fluid 5 in the wedge spaces 73 and 74 is used. As the pressure increases, the elastic flexible vane 63 is greatly elastically deformed so that the free end 77 side of the elastic flexible vane 63 is further away from the inner peripheral surface 2 of the container 3 than at normal temperature, so that the wedge spaces 73 and 74 are formed. As a result of widening compared with the normal temperature, the flow resistance increases due to the increase in viscosity of the viscous fluid 5 itself and the flow resistance decreases due to the expansion of the wedge spaces 73 and 74. On the other hand, when the viscous fluid 5 whose viscosity is lower than that at normal temperature passes through the wedge spaces 73 and 74 at a high temperature, the elastic flexible vane 63 is freed by the pressure reduction of the viscous fluid in the wedge spaces 73 and 74. As a result of the elastic flexible vane 63 being elastically deformed small and narrowing the wedge spaces 73 and 74 so that the end 77 side is closer to the inner peripheral surface 2 of the container 3 than at normal temperature, the flow due to a decrease in the viscosity of the viscous fluid 5 itself. Due to the decrease in resistance and the increase in flow resistance due to the reduction of the wedge spaces 73 and 74, braking at normal temperature can be maintained despite high temperature, and thus the generated braking has no temperature dependence, and high temperature. However, as a result of being able to obtain braking that does not change even at low temperatures and to reduce the rotational force due to the weight of the backrest 13 by the spiral spring 14, the backrest 13 is folded to the folding rotational position P2, and the shock is not shocked. It can be rotated back to the backrest 13 to the predetermined rotational position P1 by a small manual force it is possible to bring the.

  The rotary damper 1 described above has two pairs of elastic flexible vanes 63 and 64, and 69 and 70. However, the rotary damper of the present invention is elastically movable with the pair of elastic flexible vanes 63 and 64. The flexible vane 69 or 70 may be included, and three or more pairs of elastic flexible vanes may be included.

DESCRIPTION OF SYMBOLS 1 Rotary damper 2 Inner peripheral surface 3 Container 4 Outer peripheral surface 5 Viscous fluid 6 Space 7 Rotating body 8 Vane means 9 One end part 10 Vehicle seat 11 Seat part 12 Other end part 13 Backrest part 14 Spiral spring

Claims (8)

A seat portion of a vehicle seat and a cylindrical inner peripheral surface fixed to one of a backrest portion rotatably connected to the seat portion so as to be rotatable between an initial rotation position and a folding rotation position. The container is accommodated in the container so as to form a space for accommodating the viscous fluid between the container and the cylindrical inner peripheral surface of the container and the cylindrical outer peripheral surface concentric with the inner peripheral surface. A rotating body that is arranged so as to be rotatable relative to the body and is fixed to a rotating shaft fixed to the other one of the seat part and the backrest part of the vehicle seat, and is folded from the initial rotational position of the backrest part In the relative rotation in one direction of the rotating body with respect to the container in the direction toward the rotational position, a large flow resistance is exerted on the viscous fluid, and one of the rotating bodies with respect to the container in the direction from the folding rotation position of the backrest toward the initial rotation position. Relative rotation in the direction of Thus, in the relative rotation in the other direction, which is the opposite direction, between the cylindrical inner peripheral surface of the container and the cylindrical outer peripheral surface of the rotating body in order to generate a flow resistance smaller than the flow resistance, respectively. Vane means disposed in a space for storing the viscous fluid of the vehicle, and one end portion connected to one of the seat portion and the backrest portion of the vehicle seat, and the other end portion of the seat portion and the backrest portion of the vehicle seat The rotary shaft is connected to the rotary shaft fixed to the other of the two, and the backrest portion increases from the predetermined rotation position between the initial rotation position and the folding rotation position toward the folding rotation position and toward the folding rotation position. A spiral spring that imparts an elastic rotational force that resists rotation in the direction, and the spiral spring is disposed on the seat portion and the back portion side of the vehicle seat with respect to the rotating body, and the other end portion of the spiral spring. formed on the rotary shaft Is configured to be coupled to the rotary shaft by being fitted into a slit extending axially from one end of the rotating shaft, the rotating shaft is hexagonal from one end of the rotating shaft to the other end A rotary damper for a vehicle seat having a certain outer peripheral surface, and having a distal end portion at one end portion of a rotating shaft being forked by a slit .   The spiral spring is connected to the container at one end, and the reaction that occurs at one end of the spiral spring in applying an elastic rotational force in a direction from the predetermined rotation position to the folding rotation position toward the initial rotation position. A first reaction force receiving member fixed to the container for receiving a force, and one end portion for applying an elastic rotational force in a direction from the predetermined rotational position to the folding position of the backrest portion from the predetermined rotational position to the initial rotational position. The rotary damper for a vehicle seat according to claim 1, further comprising a second reaction force receiving member fixed to the housing body so as to receive the reaction force generated in the vehicle.   The spiral spring applies elastic rotational force in the direction from the predetermined rotation position to the initial rotation position to the backrest portion from the predetermined rotation position to the folding rotation position, while the direction from the predetermined rotation position to the initial rotation position is the direction toward the folding rotation position. The elastic rotational force is applied, and one end of the spiral spring is interposed between the first reaction force receiving member and the second reaction force receiving member. Rotary damper for vehicle seats.   The spiral spring is an elastic material that gradually increases against the gradually increasing rotational force generated in the backrest portion in the direction toward the folding rotation position based on the weight of the backrest portion in the rotation of the backrest portion in the direction from the predetermined rotation position toward the folding rotation position. The rotary damper for a vehicle seat according to any one of claims 1 to 3, wherein a rotational force is applied to the backrest portion.   The vane means divides a space for accommodating the viscous fluid between the cylindrical inner peripheral surface of the container and the cylindrical outer peripheral surface of the rotating body into two chambers and is formed integrally with the outer peripheral surface of the rotating body. A pair of elastic flexible vanes and at least one of the two chambers defined by the pair of elastic flexible vanes are further divided into two chambers and formed integrally on the inner peripheral surface of the container. The rotary damper for a vehicle seat according to any one of claims 1 to 4, further comprising another elastic flexible vane.   Another elastic flexible vane has a base portion formed integrally with the inner peripheral surface of the container, and an arcuate surface formed integrally with the base portion and facing the outer peripheral surface of the rotating body. The rotary damper for a vehicle seat according to claim 5, further comprising an elastically flexible tongue.   Each of the pair of elastic flexible vanes has a curved convex surface that is connected to the outer peripheral surface of the rotating body at one end and is convex in a direction opposite to the relative rotation in one direction of the rotating body with respect to the container. And a curved concave surface that is connected to the outer peripheral surface of the rotating body at one end and extends along the convex surface corresponding to the convex surface, and the convex surface on the other end side with respect to the container A pair of wedge spaces facing each other in the rotation direction of the relative rotation of the rotating body are formed as arcuate convex surfaces between the inner peripheral surface of the container, and the arcuate convex surfaces are relative to the container relative to the container. The radial width of one wedge space communicating with one of the two adjacent chambers with the arcuate convex surface in the rotational direction of the general rotation is the rotational direction of the relative rotation of the rotating body with respect to the container Two adjacent chambers with the arc-shaped convex surface in between The radial width of the one wedge space is determined so that the width gradually decreases toward the other wedge space communicating with the other chamber, and the rotation of the rotating body relative to the container is rotated. The radial width of the other wedge space communicating with the other of the two adjacent chambers with the arcuate convex surface in the direction is the arcuate convex surface in the rotational direction of the relative rotation of the rotating body with respect to the container The width in the radial direction of the other wedge space is determined so as to gradually become narrower toward one wedge space communicating with one of the two adjacent chambers. The viscous fluid that passes through the wedge space elastically deflects each of the pair of elastic flexible vanes and determines the radial width of the pair of wedge spaces based on the viscosity thereof. Each flexible vane is predetermined from the initial rotational position. In the rotation with respect to the seat portion of the backrest portion to the folding rotation position via the rolling position, it flows through the pair of wedge spaces narrowed to one chamber from the other chamber and is defined by the pair of narrowed wedge spaces. While the viscous fluid is adapted to generate a flow resistance against the rotation, the rotation of the backrest from the folding rotation position to the initial rotation position via the predetermined rotation position from one chamber to the other 2. The viscous fluid is caused to flow through a pair of wedge spaces widened in a chamber and is defined by the pair of widened wedge spaces and resists the rotation. The rotary damper for vehicle seats as described in any one of 1-6.   The predetermined rotation position is a position where a rotational force in a direction toward the folding rotation position based on the weight of the backrest portion starts to be generated in the backrest portion in the rotatable range of the backrest portion, and the spiral spring is folded from the predetermined rotation position to the folding rotation position. The rotary damper for a vehicle seat according to any one of claims 1 to 7, wherein an elastic rotational force that gradually increases in a direction toward the initial rotational position is applied to the backrest portion.

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